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(A) Maximal quadriceps torque (QMVC), quadriceps peak twitch (QPt) and peripheral voluntary activation (peripheral VA) in patients with COPD experiencing desaturation (NREMDes) and nondesaturation (NREMnoDes). (B) Medians and quartile box plots of motor cortex activation (cortical VA) in patients with COPD experiencing desaturation (NREMDes) and nondesaturation (NREMnoDes) (nonparametric data). NREM, nonrapid eye movement.
